8. Step 2 Elig: Bone Marrow Function - patients must have adequate bone marrow function, defined as: a. Peripheral absolute neutrophil count (ANC) ≥ 1000/µL b. Platelet count ≥ 30,000/µL (transfusion independent) c. Hemoglobin ≥ 9.0 gm/dL (may receive RBC transfusions) d. Post-op CSF flow study shows re-establishment of CSF flow.